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2 January, 12:47

If the variance of a discrete random variable x is v (x) = 1.6, then v (2x + 3) is

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  1. 2 January, 14:17
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    Adding an offset to the data changes the mean, but not the variance. Multiplying the data by a constant changes the variance by the square of that constant.

    v (a·x) = a²·v (x)

    You will have v (2x+3) = 2²·v (x) = 4·1.6 = 6.4
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